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GB/T 9124 consists of the following two parts under the general title Steel pipe flanges:
——Part 1: PN designed;
——Part 2: Class designated.
This is Part 1 of GB/T 9124.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces the contents of PN designed flanges specified in GB/T 9112-2010 Types and parameters for steel pipe flanges, GB/T 9113-2010 Integral steel pipe flanges, GB/T 9114-2010 Hubbed screwed steel pipe flanges, GB/T 9115-2010 Butt-welding steel pipe flange, GB/T 9116-2010 Hubbed slip-on-welding steel pipe flanges, GB/T 9117-2010 Hubbed socket welding steel pipe flanges, GB/T 9118-2010 Loose hubbed steel pipe flanges with welding neck collar, GB/T 9119-2010 Slip-on-welding plate steel pipe flanges, GB/T 9120-2010 Loose plate steel pipe flanges with weld-neck collar and with weld ring neck, GB/T 9121-2010 Loose plate steel pipe flanges with weld-on collar, GB/T 9122-2010 Loose plate steel pipe flanges with lapped pipe end and pressed collar with long neck, GB/T 9123-2010 Steel pipe blank flanges and GB/T 9124-2010 Specification for steel pipe flanges; those of Class designated are incorporated in GB/T 9124, Part 2; the following main changes have been made with respect to GB/T 9112~9124-2010 series:
——the contents of PN designated flanges in Edition 2010 are supplemented and revised;
——the nominal pressure range of blind flange is extended from PN2.5~PN160 to PN2.5~PN400;
——the nominal size range of hubbed screwed flanges is changed from DN10~DN1000 to DN10~DN150;
——the outside diameter of steel pipe is revised, and the flange size is revised accordingly;
——some materials for flanges and their pressure-temperature ratings are supplemented;
——other relevant contents such as technical requirements are revised and improved;
——the method for determining the pressure-temperature rating is added.
This part is redrafted by reference to but is not equivalent to ISO 7005-1: 2011 Pipe flanges - Part 1: Steel flanges for industrial and general service piping systems.
This part was proposed by China Machinery Industry Federation.
This part is under the jurisdiction of National Technical Committee on Pipelines and Accessories of Standardization Administration of China (SAC/T C237).
The previous editions of this part are as follows:
——GB/T 9112~9124-1988, GB/T 9112~9124-2000, GB/T 9112~9124-2010.
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Introduction
GB/T 9112~9124-2010 series are mainly divided into 13 standards according to different flange types and are integrated into 2 standards after revision according to nominal pressure series of flanges, i.e., GB/T 9124.1-2019 Steel pipe flanges - Part 1: PN designated and GB/T 9124.2-2019 Steel pipe flanges - Part 2: Class designated.
ISO 7005-1: 2011 Pipe flanges - Part 1: Steel flanges for industrial and general service piping systems specifies the technical contents of steel pipe flanges such as terms and definitions, purchaser specification data, process, pressure limits, material, application considerations, other considerations for specification, installation guidance and information to be specified by the purchaser; compared with ISO 7005-1: 1992, ISO 7005-1: 2011 no longer specifies detailed technical parameters, but requires direct reference to CEN standard EN 1092-1 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges, and ASMEB 16.5 Pipe flanges and flanged fittings NPS 1/2 through NPS 24 metric/inch standard and ASMEB 16.47 Large diameter steel flanges NPS 26 through NPS 60 metric/inch standard.
The flange sizes specified in this part are interchangeable with those in EN 1092-1: 2018, with basically same technical requirements. The following main changes have been made with respect to EN 1092-1: 2018:
——the writing format of this part is different from EN 1092-1: 2018;
——according to the requirements of users in China, the flange nominal size range is appropriately extended, for example, the flange sizes of DN20 and DN32 with nominal pressure range of PN160~PN400 are added;
——according to the requirements of users in China, the types and sizes of flanges with ring joint faces are added;
——the types and sizes of hubbed socket welding flanges are supplemented;
——EN 1092-1: 2018 includes only one outside diameter series of steel pipe, while this part includes two outside diameter series of steel pipe; wherein, DN10~DN2400 steel pipes in Series I are basically the same as but DN65 and DN125 are different from those in EN 1092-1: 2018, DN2600~DN4000 steel pipes in Series II are the same as those in EN 1092-1: 2018;
——the flange material is different from that in EN 1092-1: 2018. The flange materials with Chinese designations are adopted in this part, of which, the pressure-temperature ratings are determined by reference to EN 1092-1: 2018;
——the order contract data of flanges are added;
——the pipe schedule number and steel pipe wall thickness are added;
——the corresponding relationship between this part and EN 1092-1 in terms of code for flange type and code for sealing face is added.
Steel pipe flanges - Part 1: PN designated
1 Scope
This part of GB/T 9124 specifies the styles and parameters, types and sizes, technical requirements, test, inspection and acceptance, signs and designations, and supply requirements of PN designated steel pipe flanges and blind flanges.
This part is applicable to steel pipe flanges and blind flanges with nominal pressure of PN2.5~PN400 and nominal size of DN10~DN4000.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 152.4 Fasteners - Counterbores for hexagon bolts and nuts
GB/T 700 Carbon structural steels
GB/T 711 Hot-rolled quality carbon structural steel plates and wide strips
GB/T 712 Ship and ocean engineering structural steel
GB/T 713 Steel plates for boilers and pressure vessels
GB/T 1047 Pipework components - Definition and selection of nominal size
GB/T 1048 Pipework components - Definition and selection of nominal pressure
GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 3531 Low alloy steel plates for low temperature pressure vessels
GB/T 4237 Hot rolled stainless steel plate, sheet and strip
GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1: Parallel internal and taper external threads
GB/T 9125 Fasteners for steel pipe flange joints
GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings
GB/T 12229 General purpose industrial valves - Specification of carbon steel castings
GB/T 12230 General purpose industrial valves - Specification of stainless steel castings
GB/T 12716 Taper pipe threads with 60 degree
GB/T 14976 Seamless stainless steel pipes for fluid transport
GB/T 16253 Steel castings for pressure purposes
JB/T 5263 Specification for steel casting for power station valves
JB/T 7248 Technical specification for low temperature service steel casting for valves
NB/T 47008 Carbon and alloy steel forgings for pressure equipment
NB/T 47009 Alloy steel forgings for low temperature pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment
3 Styles and parameters
3.1 Nominal pressure
3.1.1 See GB/T 1048 for the definition of nominal pressure.
3.1.2 This part specifies the following 12 PN designated pressure grades:
PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN320 and PN400.
3.2 Nominal size
3.2.1 See GB/T 1047 for the definition of nominal size.
3.2.2 This part specifies the following 39 DN designated specifications:
DN10, DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600, DN700, DN800, DN900, DN1000, DN1200, DN1400, DN1600, DN1800, DN2000, DN2200, DN2400, DN2600, DN2800, DN3000, DN3200, DN3400, DN3600, DN3800 and DN4000.
3.3 Outside diameter of Steel pipe
Series I and Series II outside diameters of steel pipe are applicable to this part. The nominal size of PN2.5~PN160 pipe flanges and outside diameter of steel pipe shall meet the requirements of Table 1, and those of PN250~PN400 pipe flanges shall meet the requirements of Table 2.
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Table 1 Nominal size of PN2.5~PN160 and outside diameter of steel pipe
In mm
Nominal size/DN Outside diameter of steel pipe
Series I Series II
10 17.2 14
15 21.3 18
20 26.9 25
25 33.7 32
32 42.4 38
40 48.3 45
50 60.3 57
65 73.0 76
80 88.9 89
100 114.3 108
125 141.3 133
150 168.3 159
200 219.1 219
250 273.0 273
300 323.9 325
350 355.6 377
400 406.4 426
450 457 480
500 508 530
600 610 630
700 711 720
800 813 820
900 914 920
1000 1016 1020
1200 1219 1220
1400 1422 1420
1600 1626 1620
1800 1829 1820
2000 2032 2020
2200 2235 2220
2400 2438 2420
2600 2642 2620
2800 2845 2820
3000 3048 3020
3200 3251 3220
3400 3454 3420
3600 3658 3620
3800 3861 3820
4000 4064 4020
Table 2 Nominal size of PN250, PN320 and PN400 and outside diameter of steel pipe
In mm
Nominal size/DN PN250 PN320 PN400
Outside diameter of steel pipe
10 17.2 17.2 17.2
15 21.3 21.3 26.9
20 26.9 26.9 33.7
25 33.7 33.7 42.4
32 42.4 42.4 48.3
40 48.3 48.3 60.3
50 60.3 63.5 76.1
65 76.1 88.9 101.6
80 101.6 101.6 114.3
100 127.0 133.0 139.7
125 152.4 168.3 193.7
150 177.8 193.7 219.1
200 244.5 244.5 273.0
250 298.5 323.9 —
3.4 Types and codes of flanges
See Table 3 for types and codes of flanges. See A.1 for the corresponding relationship between this part and EN 1092-1 in terms of code for flange type.
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Styles and parameters
3.1 Nominal pressure
3.2 Nominal size
3.3 Outside diameter of Steel pipe
3.4 Types and codes of flanges
3.5 Types and codes of sealing faces
3.6 Flange types and their application scope
4 Type and size of flange
4.1 Size of flange sealing face
4.2 Type and size of flange
5 Technical requirements
5.1 Materials
5.2 Pressure-temperature rating
5.3 Size tolerance
5.4 Joint sealing face
5.5 Fasteners and gaskets
5.6 Welding end type and size
5.7 Machining and manufacturing
6 Test
7 Inspection and acceptance
7.1 Inspection
7.2 Acceptance
8 Marking and labeling
8.1 Marking
8.2 Labeling
9 Supply requirements
Annex A (Informative) Corresponding relationship between this part and EN 1092-1 in terms of code for flange type and code for sealing face
Annex B (Normative) Welding end type and size
Annex C (Informative) Reference sizes of some flanges outside the scope of this part
Annex D (Informative) Order contract data of flanges
Annex E (Informative) Method for determination of pressure-temperature ratings in EN
Annex F (Informative) Reference mass of flange
Annex G (Informative) Pipe schedule number and steel pipe wall thickness
Bibliography
